Modelling Transverse Segregation of Particulate Solids in a Rolling Drum

• Published in: Chemical engineering research & design Vol. 78; no. 4; pp. 643 - 650
• Main Authors: van Puyvelde, D.R., Young, B.R., Wilson, M.A., Schmidt, S.J.
• Format: Journal Article
• Language: English
• Published: Rugby Elsevier B.V 01.05.2000; Institution of Chemical Engineers
• Subjects: active layer; Applied sciences; Chemical engineering; Exact sciences and technology; modelling; rotating drum; segregation; Solid-solid mixing; Solid-solid systems; rotating drum; active layer; segregation; modelling; Image analysis; Mixing; Granular material; Segregation; Active layer; Theoretical study; Solid particle; Rotating cylinder; Experimental study; Empirical model; Modeling
• ISSN: 0263-8762
• DOI: 10.1205/026387600527590

Segregation of solids occurs when solid particles of varying sizes and/or densities are mixed. The size and/or density differences result in heavier and/or smaller particles being concentrated toward the centre of the solid bed in a rolling drum to form a segregated core. Segregation has important energy efficiency implications in the operation of industrial rotating kilns. In this paper, a model is developed which allows the prediction of the transverse segregation of granular material in a rolling drum. The model was derived from new experiments employing image analysis. The independent variables in this work were the particle size ratio and the operational parameters of the drum and thus the model could be easily and validly applied to practical situations. The ability of the model to predict the final steady state segregation configuration was tested against independent data and good agreement was observed.